274 EXPLANATIOIT OF THE PLATES. 



Fig. 7. — Ciliated zoospore or motile gemma of (Edogonium 

 vesicatum. 



Fig. 8. — The same in germination. Having lost its crown of 

 cilia, it has begun to emit radical filaments from its base (p. 32). 

 (Both from Thuret). 



Figs 9 and 10 (from Thwaites and Berkeley), illustrate repro- 

 duction by androspores, or minute phji;oids, formed by the ger- 

 mination of a kind of zoospores, and consisting of a pedicle and 

 two antheridial cells, containing each a single antherozoid. 

 In Fig 9, a filament of (Edogonium is shown, with several an- 

 drospores, and in Fig. 10, a similar body is seen attached to a 

 spore cell of Bulboclicete crassa — (p. 33). 



Fig. 11. — Reproduction in Vaucheria (from Pringsheim) ; a, 

 the " hornlet," or antheridium ; 6, the sporangium, both at 

 first diverticula of the general cavity of the filament, but after- 

 ward shut oS" so as to form distinct cells ; c, micropyle or ter- 

 minal pore in the sporangium, by which the antherozoids gain 

 access, when liberated by the dehiscence of the point of the horn- 

 let. The germinal body is at first covered only by a layer of 

 mucus, penetrable by the spermatic particles, but after impreg- 

 nation, this becomes consolidated into the proper coat of the 

 spore — (p. 34). 



Fig. 12. — Reproductive organs of Sporoclinus A driaticihs (from 

 Kutzing), illustrating the arrangement in the higher Algse. — a, 

 antheridial filament ; 6, sporangium. These parts are more 

 generally separated, and are frequently situated on difierent 

 plants — (p. 36). 



Fig. 13. — Antherozoid of Fucus vesiculosus (from Thuret) — 

 (p. 32.) 



Fig. 14. (from Berkeley). — Part of the hymenium of Agaricus 

 velutinus, illustrating the acrogenous fructification of the higher 

 Fungi, a, basidium, with four stalked spores on its summit — 

 (p. 42-45). 



Fig. 15. (after Currey). — Compound spore of Phragmidium 

 hnlhosum in germination, showing the production of threads of 

 mycelium from each of the compartments into which it has be- 

 come divided, and the secondary spores formed on these fila- 

 ments in the acrogenous way — (p. 44). 



